efi_loader: add firmware management protocol for FIT image

In this commit, a very simple firmware management protocol driver
is implemented. It will take a common FIT image firmware in a capsule
file and apply the data using dfu backend storage drivers via
update_fit() interface.

So "dfu_alt_info" variable should be properly set to specify a device
and location to be updated. Please read README.dfu.

Fit image is a common file format for firmware update on U-Boot, and
this protocol works neatly just as a wrapper for one.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 13e7930..7fce2cd 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -135,6 +135,17 @@
 	  Select this option if you want to enable capsule-based
 	  firmware update using Firmware Management Protocol.
 
+config EFI_CAPSULE_FIRMWARE_FIT
+	bool "FMP driver for FIT image"
+	depends on EFI_CAPSULE_FIRMWARE_MANAGEMENT
+	depends on FIT
+	select UPDATE_FIT
+	select DFU
+	default n
+	help
+	  Select this option if you want to enable firmware management protocol
+	  driver for FIT image
+
 config EFI_DEVICE_PATH_TO_TEXT
 	bool "Device path to text protocol"
 	default y